Klamath Lake 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 12912)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 28, p. Works number was 27686 in March 1906.

Locobase is puzzled by the wood-burning firebox on this logging Prairie. It seems much too small to serve the very large boiler that rode in front of it. It was designed to overcome simultaneously 2% grades and uncompensated 24-deg curves. One grade actually pitched up at 3.6%.

According to Gene Connelly's Baldwin list, the 1 was sold in 1914 to the Siskiyou Electric Power & Light Co. The SEP & L operated the engine for 25 years before selling it in 1939 to the 12-mile Central Amador Railroad, which operated on the 12-mile line between Ione and Martell, California. The CAR put it into service as the #6.

The 6 was scrapped in 1945.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID12912
RailroadKlamath Lake
Number in Class1
Road Numbers1
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.50 / 3.20
Engine Wheelbase (ft / m)26.58 / 8.10
Ratio of driving wheelbase to overall engine wheelbase 0.40
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)100,000 / 45,359
Engine Weight (lbs / kg)137,000 / 62,142
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)197,000 / 89,358
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)24,118 / 10939.75
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15
Heating Ability
Tubes (number - dia) (in / mm)310 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.08 / 4.29
Firebox Area (sq ft / m2)128.60 / 11.95
Grate Area (sq ft / m2)15.80 / 1.47
Evaporative Heating Surface (sq ft / m2)2401 / 223.14
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2401 / 223.14
Evaporative Heating Surface/Cylinder Volume380.51
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2844
Same as above plus superheater percentage2844
Same as above but substitute firebox area for grate area23,148
Power L16368
Power MT421.17

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